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1992 (1)
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1Author    Konrad DettnerRequires cookie*
 Title    Vergleichende Untersuchungen zur Wehrchemie und Drüsenmorphologie abdominaler Abwehrdrüsen von Kurzflüglern aus dem Subtribus Philonthina (Coleoptera, Staphylinidae) Comparative Investigations on Defensive Chem istry and G land Morphology of Abdominal Defensive G lands from Rove Beetles of the Subtribe Philonthina (Coleoptera, Staphylinidae)  
 Abstract    Within the rove beetle subtribe Philonthina (Staphylinidae) there are found paired abdom inal defensive glands which show a bipartition and are characterized by an unique, evaginable evapo­ ration tissue which is described for the first time. The gland chemistry is found to be character­ ized by at least 27 compounds. The m ain com ponent is represented by the alkaloid actinidine, m i­ nor components are iridodial, three possible m onoterpenoid iridodial precursors, an octadecenole and two series o f hydrocarbons and acetates which are partly branched and unsaturated. It could be shown, that the separated gland o f the evaporation tissue, whose evagination was studied, has no different synthetic abilities as com pared with the main gland system. Chemotaxonomic results according to Hennig's principle reveal an isolated position of the rove beetle tribe Q uediini within the subfamilies X antholininae and Staphylininae. The morphologically unique defensive gland of the X antholininae may be homologized with other abdom inal glands o f the Staphylinina and Philonthina, based on the comm on presence of iridoid defensive components. 
  Reference    Z. Naturforsch. 38c, 319 (1983); received July 27 1982 
  Published    1983 
  Keywords    Chemical Defence, Glands, Chemotaxonomy, Staphylinidae, Coleoptera 
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 TEI-XML for    default:Reihe_C/38/ZNC-1983-38c-0319.pdf 
 Identifier    ZNC-1983-38c-0319 
 Volume    38 
2Author    Claudia Schütz, K. Onrad DettnerRequires cookie*
 Title    Cantharidin-Secretion by Elytral Notches of Male Anthicid Species (Coleoptera: Anthicidae)  
 Abstract    Within the beetle family Anthicidae or ant-like flower beetles the canthariphilous species N o to x u s m onoceros shows a pair o f notch-like structures on the apices o f male elytra. A reser­ voir-like swelling at the apex o f each elytron contains a bilobed gland. Its glandular tubules run into the sclerotized notch. Gaschromatographic investigations o f elytral notches and the testes o f cantharidin-fed and unfed male N o to x u s m onoceros revealed huge quantities o f can­ tharidin stored in these organs in fed specimens. Other body parts, such as legs, elytral parts or flight muscles, had low cantharidin-titres, both in cantharidin-fed and unfed beetles. The can-tharidin-titres o f unfed individuals were very low compared with cantharidin-fed specimens, although cantharidin was present, mostly in notches. During sexual display the females bite several times into these notches and easily copulate, if the males had access to offered canthari­ din crystals. Thus, the elytral notches o f male N o to x u s m onoceros seem to function as "test-organs" for females which are able to select males with high cantharidin loads prior to copula­ tion. Even small quantities o f cantharidin stored in notches o f field caught specimens seem o f advantage for males in competing for a female partner. 
  Reference    Z. Naturforsch. 47c, 290—2 (1992); received September 13 1991/January 12 1992 
  Published    1992 
  Keywords    Cantharidin, Elytral N otches, Sexual Selection, Anthicidae, Coleoptera 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0290.pdf 
 Identifier    ZNC-1992-47c-0290 
 Volume    47 
3Author    A. Nahrstedt, R. H. DavisRequires cookie*
 Title    /?)MandeIonitrile and Prunasin, the Sources of Hydrogen Cyanide in All Stages of Paropsis atomaria (Coleoptera: Chysomelidae  
 Abstract    Mandelonitrile, Pruna­ sin (/?)Mandelonitrile and the cyanogenic glucoside prunasin have been established as the source of HCN in all stages of the Australian beetle Paropsis atomaria. Quantitative data for both compounds and all life stages are presented. The larvae contain a ß-glucosidase activity capable of hydrolysing prunasin and also ß-cyanoalanine synthase activity enabling the disposal of free cyanide. 
  Reference    Z. Naturforsch. 41c, 928 (1986); received May 26 1986 
  Published    1986 
  Keywords    Paropsis atomaria, Coleoptera, Cyanogenesis, Cyanogenic Glucoside, (-R) 
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 TEI-XML for    default:Reihe_C/41/ZNC-1986-41c-0928.pdf 
 Identifier    ZNC-1986-41c-0928 
 Volume    41